<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>04_导航动态显示效果</title>
  <style rel="stylesheet">
    * {
      margin: 0;
      padding: 0;
      word-wrap: break-word;
      word-break: break-all;
    }

    body {
      background: #FFF;
      color: #333;
      font: 12px/1.6em Helvetica, Arial, sans-serif;
    }

    a {
      color: #0287CA;
      text-decoration: none;
    }

    a:hover {
      text-decoration: underline;
    }

    ul, li {
      list-style: none;
    }

    img {
      border: none;
    }

    h1, h2, h3, h4, h5, h6 {
      font-size: 1em;
    }

    html {
      overflow: -moz-scrollbars-vertical; /* 在Firefox下始终显示滚动条*/
    }

    #navigation {
      width: 784px;
      padding: 8px;
      margin: 8px auto;
      background: #3B5998;
      height: 18px;
    }

    #navigation ul li {
      float: left;
      margin-right: 14px;
      position: relative;
      z-index: 100;
    }

    #navigation ul li a {
      display: block;
      padding: 0 8px;
      background: #EEEEEE;
      font-weight: 700;
    }

    #navigation ul li a:hover {
      background: none;
      color: #fff;
    }

    #navigation ul li ul {
      background-color: #88C366;
      position: absolute;
      width: 80px;
      overflow: hidden;
      display: none;
    }

    #navigation ul li ul li {
      border-bottom: 1px solid #BBB;
      text-align: left;
      width: 100%;
    }
  </style>
</head>
<body>
<div id="navigation">
  <ul>
    <li><a href="#">首 页</a></li>
    <li><a href="#">衬 衫</a>
      <ul>
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        <li><a href="#">无袖衬衫</a></li>
      </ul>
    </li>
    <li><a href="#">卫 衣</a>
      <ul>
        <li><a href="#">开襟卫衣</a></li>
        <li><a href="#">套头卫衣</a></li>
      </ul>
    </li>
    <li><a href="#">裤 子</a>
      <ul>
        <li><a href="#">休闲裤</a></li>
        <li><a href="#">卡其裤</a></li>
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        <li><a href="#">短裤</a></li>
      </ul>
    </li>
    <li><a href="#">联系我们</a></li>
  </ul>
</div>

</body>
</html>